BiteTheDDDDt commented on code in PR #64413:
URL: https://github.com/apache/doris/pull/64413#discussion_r3426631698
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be/src/storage/tablet/tablet_reader.h:
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@@ -158,6 +158,12 @@ class TabletReader {
std::vector<ColumnId> return_columns;
// output_columns only contain columns in OrderByExprs and outputExprs
std::set<int32_t> output_columns;
+ // Storage key columns that are present only for scan-schema alignment.
+ // Example: for AGG keys (k1, k2), a query that returns k2 can scan
+ // (k1, k2) and project away k1. Direct readers may avoid reading such
+ // columns only if the lower iterator proves their real values are not
+ // required by predicates, delete conditions, or expressions.
+ std::set<ColumnId> filled_columns;
Review Comment:
这个是要用来判断是否contains
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